The challenge
Given 2 strings, a and b, return a string of the form short+long+short, with the shorter string on the outside and the longer string on the inside. The strings will not be the same length, but they may be empty ( length `` ).
For example:
solution("1", "22") # returns "1221"
solution("22", "1") # returns "1221"
The solution in Python code
Option 1:
def solution(a, b):
if a.isdigit():
if a<b:
return f"{a}{b}{a}"
else:
return f"{b}{a}{b}"
else:
if len(a)<len(b):
return f"{a}{b}{a}"
else:
return f"{b}{a}{b}"
Option 2:
def solution(a, b):
return a+b+a if len(a)<len(b) else b+a+b
Option 3:
def solution(a, b):
return '{0}{1}{0}'.format(*sorted((a, b), key=len))
Test cases to validate our solution
import test
from solution import solution
@test.describe("Fixed Tests")
def fixed_tests():
@test.it('Basic Test Cases')
def basic_test_cases():
test.assert_equals(solution('45', '1'), '1451')
test.assert_equals(solution('13', '200'), '1320013')
test.assert_equals(solution('Soon', 'Me'), 'MeSoonMe')
test.assert_equals(solution('U', 'False'), 'UFalseU')
